package com.itheima.reggie.controller;

import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
import com.itheima.reggie.common.BaseContext;
import com.itheima.reggie.common.R;
import com.itheima.reggie.entity.ShoppingCart;
import com.itheima.reggie.service.ShoppingCartService;
import lombok.extern.slf4j.Slf4j;
import org.apache.commons.codec.net.BCodec;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.*;

import java.time.LocalDateTime;
import java.util.List;

/**
 * 购物车
 */
@Slf4j

@RestController
@RequestMapping("/shoppingCart")
public class ShoppingCartController {

    @Autowired
    private ShoppingCartService shoppingCartService;

    /**
     * 添加购物车
     * @param shoppingCart
     * @return
     */
    @PostMapping("/add")
    public R<ShoppingCart> add(@RequestBody ShoppingCart shoppingCart){
        log.info("购物车数据：{}",shoppingCart);

        //设置用户id 指定当前是那个用户的购物车数据
        Long currentId = BaseContext.getCurrentId();
        shoppingCart.setUserId(currentId);

        //查询当前菜品或者套餐是否在购物车中
        Long dishId = shoppingCart.getDishId();
        LambdaQueryWrapper<ShoppingCart> queryWrapper = new LambdaQueryWrapper<>();
        queryWrapper.eq(ShoppingCart::getUserId,currentId);
        if (dishId != null){
            //添加到购物车的是菜品
            queryWrapper.eq(ShoppingCart::getDishId,dishId);
        }else {
            //添加到购物车的是套餐
            queryWrapper.eq(ShoppingCart::getSetmealId,shoppingCart.getSetmealId());
        }

        //SQl:select * from shopping_cart where user_id = ? and dish_id/setmeal_id = ?
        //查询当前菜品或者套餐是否在购物车中
        ShoppingCart cartServiceOne = shoppingCartService.getOne(queryWrapper);

        if (cartServiceOne != null){
            //如果已经存在，就在原来数量基础上加一
            Integer number = cartServiceOne.getNumber();
            cartServiceOne.setNumber(number+1);
            shoppingCartService.updateById(cartServiceOne);
        }else {
            //如果不存在，则添加到购物车，数量默认就是一
            shoppingCart.setNumber(1);
            shoppingCart.setCreateTime(LocalDateTime.now());
            shoppingCartService.save(shoppingCart);
            cartServiceOne = shoppingCart;
        }
        return R.success(cartServiceOne);
    }

    /**
     * 减少购物车
     * @param shoppingCart
     * @return
     */
    @PostMapping("/sub")
    public R<ShoppingCart> sub(@RequestBody ShoppingCart shoppingCart){
        Long dishId = shoppingCart.getDishId();
        LambdaQueryWrapper<ShoppingCart> queryWrapper = new LambdaQueryWrapper<>();
        if (dishId != null){
            //减少购物车的是菜品
            queryWrapper.eq(ShoppingCart::getDishId,dishId);
            queryWrapper.eq(ShoppingCart::getUserId, BaseContext.getCurrentId());
        }else {
            //减少购物车的是套餐
            queryWrapper.eq(ShoppingCart::getSetmealId,shoppingCart.getSetmealId());
        }
        ShoppingCart cart = shoppingCartService.getOne(queryWrapper);
        cart.setNumber(cart.getNumber()-1);
        Integer LatestNumber = cart.getNumber();
        if (LatestNumber>0){
            //对数据进行更新
            shoppingCartService.updateById(cart);
        }else if (LatestNumber == 0){
            //如果购物车为0，那么把菜品从购物车删除
            shoppingCartService.removeById(cart.getId());
        }else {
            return R.error("操作异常");
        }
        return R.success(cart);
    }
    /**
     * 减少购物车
     * @param shoppingCart
     * @return

    @PostMapping("/sub")
    public R<ShoppingCart> sub(@RequestBody ShoppingCart shoppingCart){
        Long dishId = shoppingCart.getDishId();
        LambdaQueryWrapper<ShoppingCart> queryWrapper = new LambdaQueryWrapper<>();

        //代表数量减少的是菜品数量
        if(dishId!=null){
            //通过dishID查看购物车对象
            queryWrapper.eq(ShoppingCart::getDishId,dishId);
            //加条件以防删除其他人的购物车
            queryWrapper.eq(ShoppingCart::getUserId, BaseContext.getCurrentId());
            ShoppingCart cart = shoppingCartService.getOne(queryWrapper);
            cart.setNumber(cart.getNumber()-1);
            Integer LatestNumber = cart.getNumber();
            if (LatestNumber>0){
                //对数据进行更新
                shoppingCartService.updateById(cart);
            }else if (LatestNumber == 0){
                //如果购物车为0，那么把菜品从购物车删除
                shoppingCartService.removeById(cart.getId());
            }else {
                return R.error("操作异常");
            }
            return R.success(cart);
        }

        //代表减少了套餐数量
        Long setmealId = shoppingCart.getSetmealId();
        if (setmealId!=null){
            queryWrapper.eq(ShoppingCart::getSetmealId,setmealId);
            ShoppingCart cart = shoppingCartService.getOne(queryWrapper);
            cart.setNumber(cart.getNumber()-1);
            Integer LatestNumber = cart.getNumber();
            if (LatestNumber>0){
                //对数据进行更新
                shoppingCartService.updateById(cart);
            }else if (LatestNumber==0){
                //如果购物车为0，那么把菜品从购物车删除
                shoppingCartService.removeById(cart.getId());
            }else {
                return R.error("操作异常");
            }
            return R.success(cart);
        }
        //如果不是减少菜品和套餐
        return R.error("操作异常");
    }
     */

    /**
     * 查看购物车
     * @return
     */
    @GetMapping("/list")
    public R<List<ShoppingCart>> list(){
        log.info("查看购物车...");

        LambdaQueryWrapper<ShoppingCart> queryWrapper = new LambdaQueryWrapper<>();
        queryWrapper.eq(ShoppingCart::getUserId,BaseContext.getCurrentId());
        queryWrapper.orderByAsc(ShoppingCart::getCreateTime);

        List<ShoppingCart> list = shoppingCartService.list(queryWrapper);

        return R.success(list);
    }

    /**
     * 清空购物车
     * @return
     */
    @DeleteMapping("/clean")
    public R<String> clean(){
        //SQl：select from shopping_cart where user_id = ?

        LambdaQueryWrapper<ShoppingCart> queryWrapper = new LambdaQueryWrapper<>();
        queryWrapper.eq(ShoppingCart::getUserId,BaseContext.getCurrentId());

        shoppingCartService.remove(queryWrapper);

        return R.success("清空购物车成功");
    }
}
